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Decatur weather live forecast
Today's maximum temperature in Decatur is expected to be 68°F. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.
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Thursday
4th Sep
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Friday
5th Sep
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Saturday
6th Sep -
Sunday
7th Sep -
Monday
8th Sep
5-day weather forecast updated at 04:01 on Thursday 4th September 2025 GMT
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The 5-day weather forecast for Illinois (Decatur) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.
Decatur weather forecast by day
Below are the detailed weather forecasts for Decatur for the next 5 days.
Decatur weather for Thursday 4th September 2025
Expect scattered clouds in Decatur, Illinois with a maximum temperature of 68°F, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 5 mph from the north-west.
- °F maximum temperature
- °F minimum temperature
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scattered clouds
- hours of sunshine
- UV index (Moderate)
- mm of rainfall expected
- no heat & humidity
- mph wind from NW
Decatur weather for Friday 5th September 2025
Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 66°F, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 26% chance of some rain and a light breeze of 7 mph from the west.
- °F maximum temperature
- °F minimum temperature
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isolated thunderstorms
- hours of sunshine
- UV index (High)
- % chance of some rain
- mm of rainfall expected
- °F wind chill
- mph wind from W
Decatur weather for Saturday 6th September 2025
Expect scattered clouds in Decatur, Illinois with a maximum temperature of 70°F, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the west.
- °F maximum temperature
- °F minimum temperature
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scattered clouds
- hours of sunshine
- UV index (Moderate)
- mm of rainfall expected
- no heat & humidity
- mph wind from W
Decatur weather for Sunday 7th September 2025
Expect scattered clouds in Decatur, Illinois with a maximum temperature of 70°F, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the north-west.
- °F maximum temperature
- °F minimum temperature
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scattered clouds
- hours of sunshine
- UV index (High)
- mm of rainfall expected
- °F wind chill
- mph wind from NW
Decatur weather for Monday 8th September 2025
Expect clear skies in Decatur, Illinois with a maximum temperature of 72°F, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 2 mph from the east.
- °F maximum temperature
- °F minimum temperature
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clear skies
- hours of sunshine
- UV index (High)
- mm of rainfall expected
- °F wind chill
- mph wind from E
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- Pay £0 deposits with direct debit & spread the cost
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Metric (°C) | Imperial (°F)
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